Text Not being exported to GLTF
glTF is a GPU-ready format that only supports meshes, not other types of geometry directly.  To make the text compatible with glTF, look for the convert option in the Object menu of the 3D view:

Object -> Convert To... -> Mesh from Curve/Meta/Surf/Text

If needed, make a copy of the text beforehand.  Once converted to a mesh, you won't be able to change the font or letters used, but you can apply normal mesh modifications to it.